docs: def update_window(turn_from, tick_from, turn_to, tick_to, updfun, branchd):
      """Iterate over a window of time in ``branchd`` and call ``updfun`` on the values"""
      if turn_from in branchd:
          # Not including the exact tick you started from because deltas are *changes*
          for past_state in branchd[turn_from][tick_from+1:]:
              updfun(*past_state)
      for midturn in range(turn_from+1, turn_to):
          if midturn in branchd:
              for past_state in branchd[midturn][:]:
                  updfun(*past_state)
      if turn_to in branchd:
          for past_state in branchd[turn_to][:tick_to+1]:
              updfun(*past_state)